Process of accelerating the elimination of occluded slag from molten metal.



UNITED STATES I PATENT OFFICE.

ROBERT LOCK, OF TARENTUM, PENNSYLVANIA.

PROCESS OF ACCELERATIN THE ELIMINATION OF OCCLUDED SLAG FROM MOLTEN METAL.

No Drawing.

To all whom it may concern:

Be it known that I, Ronnn'r Loclt. a citizen of the United States, residing at 'larentum, in the county of Allegheny and State of Pennsylvania, have invented new and use ful Improvements in Processes for Accelerating the Elin'iination ol ()rcluded Slag lrom Molten Metal, of which the following is a specification.

This invention relates to a certain new and improved process for accelerating the elimination of occluded slag t'rom molten metal before solidification.

It is well known that molten steel or molten iron, by whatever process it may be prepared, contains suspended in it small bodies, globules or particles of slag which. unless they be released or removed prior to the solidification of the metal. become entrapped and inelosed in the metal. and are retained in the solid metal to the great. detriment of the quality of the latter.

The object of the present. invention is to accelerate the elimination of such slaggy bodies or particles from the molten metal before solidification, so that the ultimate solid metal product is relatively free therefrom. i

In oarryingout my process the metal is melted down in the usual way in conjunct-ion with any or all of the fluxes and reagents commonly employed. I then tap the fluid metal from the furnace or converter into a ladle in the usual way, the super n'atant slag being allowed to remain on top of the metal in the ladle. or flowed over the lip of the'ladle, either with or without thick ening with lime or dolomite, or treatment with any other reagent in any usual way. From the foregoing ladle the metal is transferred in a thin stream to a second ladle, preferably by bottom pouring, varying amounts of lime or other suitable reagent.

preheated or not. being gradually and con currently thrown into the secoml ladle. Br this means the metal flows into the second ladle in a small stream and the slag globules come. into intimate contact with the time 'or other reagent and are thereby held and eliminated from the molten metal.

it will be readily apparent that the i iollen metal treated by the foregoing process Will possess a high degree of purity ant that by reason of the practical -=limination )t' the impurities usually I't-liresonltd by slag the metal is rendered more hom-of enous and less susceptible to electrolytic dis: 'sociatioi.

I claim as my invention 1. The method of eliminating slag from molten metal cmnprising tapping the molten metal in a thin stream into a suitable rcceptacle and gradually and concurrently introducing a slag removing reagent.

2. The method of eliminating slag from molten metal consisting in melting, down the metal and tapping it into a ladle, pouring the metal in a thin stream from said ladle into a second ladle to separate it from the slag, floating thereon in the first ladle. and gradually and concurrem'ly introducng a slag removing reagent into the second ladle.

3. The method of eliminating slag from molten metal consisting in melting down the metal and tapping it into a ladle, pouring the metal in a thin stream from said ladle into a second ladle to separate it fromtbe slag floating thereon in'the first ladle, and.

gradually introducing a preheated slag removing reagent into the second ladle.

In testimony whereof I have hereunto eat, 30"

my hand in presence of two subscribing wit nesses.

ROBERT LOCK. Witnesses i An'rnmi'P. Scor'r, ARNOLD C. TUCKER.

Patented Nov. 14-. I911.

Application filed March 1, 1911. Serial No. 611,670. 

